from django.shortcuts import render_to_response, get_object_or_404

from django.http import HttpResponse
from django.http import HttpResponseRedirect
from django.core.urlresolvers import reverse
from python.common.polls.models import Choice, Poll

RELATIVE_TEMPLATE_DIR = 'python/common/polls/'
def template(template_name):
    return RELATIVE_TEMPLATE_DIR + template_name;

#def index(request):
#    latest_poll_list = Poll.objects.all().order_by('-pub_date')[:5]
#    return render_to_response(template('index.html'), {'latest_poll_list': latest_poll_list})


#def detail(request, poll_id):
#    p = get_object_or_404(Poll, pk=poll_id)
#    return render_to_response(template('detail.html'), {'poll': p})
#
#def results(request, poll_id):
#     p = get_object_or_404(Poll, pk=poll_id)
#     return render_to_response(template('results.html'), {'poll': p})


def vote(request, poll_id):
    p = get_object_or_404(Poll, pk=poll_id)
    try:
        selected_choice = p.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
        # Redisplay the poll voting form.
        return render_to_response(template('poll_detail.html'), {
            'object': p,
            'error_message': "You didn't select a choice.",
        })
    else:
        selected_choice.votes += 1
        selected_choice.save()
        # Always return an HttpResponseRedirect after successfully dealing
        # with POST data. This prevents data from being posted twice if a
        # user hits the Back button.
        return HttpResponseRedirect(reverse('poll_results', args=(p.id,)))
